1 files changed, 105 insertions, 0 deletions
diff --git a/attic/muse_qt4_evolution/muse/fifo.h b/attic/muse_qt4_evolution/muse/fifo.h
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+++ b/attic/muse_qt4_evolution/muse/fifo.h
@@ -0,0 +1,105 @@
+//=============================================================================
+//  MusE
+//  Linux Music Editor
+//  $Id:$
+//
+//  Copyright (C) 2002-2006 by Werner Schweer and others
+//
+//  This program is free software; you can redistribute it and/or modify
+//  it under the terms of the GNU General Public License version 2.
+//
+//  This program is distributed in the hope that it will be useful,
+//  but WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+//  GNU General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program; if not, write to the Free Software
+//  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+//=============================================================================
+
+#ifndef __FIFO_H__
+#define __FIFO_H__
+
+const int FIFO_BUFFER = 256;
+
+//---------------------------------------------------------
+//   Fifo
+//---------------------------------------------------------
+
+struct FifoBuffer {
+      float* buffer;
+      int size;
+      int maxSize;
+      unsigned pos;
+      int segs;
+
+      FifoBuffer() {
+            buffer  = 0;
+            size    = 0;
+            maxSize = 0;
+            }
+      };
+
+//---------------------------------------------------------
+//   FifoBase
+//    - works only for one reader/writer
+//    - reader writes ridx
+//    - writer writes widx
+//    - reader decrements counter
+//    - writer increments counter
+//    - counter increment/decrement must be atomic
+//---------------------------------------------------------
+
+class FifoBase {
+
+   protected:
+      int ridx;               // read index
+      int widx;               // write index
+      volatile int counter;   // objects in fifo
+
+   public:
+      FifoBase()          { clear(); }
+      virtual ~FifoBase() {}
+      void clear();
+      virtual void push();    // put object on fifo
+      virtual void pop();     // remove object from fifo
+      int count() const     { return counter; }
+      int readIndex() const { return ridx; }
+      };
+
+//---------------------------------------------------------
+//   Fifo
+//---------------------------------------------------------
+
+class Fifo : public FifoBase {
+      int nbuffer;            // max buffer size (fifo-size)
+      FifoBuffer** buffer;
+
+   public:
+      Fifo();
+      ~Fifo();
+      bool put(int, unsigned long, float** buffer, unsigned pos);
+      bool getWriteBuffer(int, unsigned long, float** buffer, unsigned pos);
+      bool get(int, unsigned long, float** buffer, unsigned pos);
+      bool get(int, unsigned long, float** buffer);
+      };
+
+//---------------------------------------------------------
+//   Fifo1
+//---------------------------------------------------------
+
+class Fifo1 : public FifoBase {
+   public:
+      unsigned positions[FIFO_BUFFER];
+
+      Fifo1() : FifoBase() {}
+      int setWritePos(unsigned pos) {
+            positions[widx] = pos;
+            return widx;
+            }
+      unsigned readPos() const { return positions[ridx]; }
+      };
+
+#endif
+